# stagehand-python@4.2.0a0.dev1528: fix(cli): restore V3 network capture through a CDP sidecar ( 2849)

Category: open-source
Published: 2026-09-22T19:45:05Z
Source: [Browserbase Stagehand releases](https://github.com/browserbase/stagehand/releases/tag/stagehand-python%404.2.0a0.dev1528)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-23T06:17:40.389Z
Tags: browserbase, browser-agent, automation

## Human Summary
Browserbase Stagehand releases published stagehand-python@4.2.0a0.dev1528: fix(cli): restore V3 network capture through a CDP sidecar ( 2849). Summary Restore Browse V3 network-capture behavior on Stagehand V4 through a CLI-private CDP sidecar, without committing core Stagehand, its protocol, or generated SDKs to a public network-event schema. Stack ( 2872)…

## Agent Summary
Treat stagehand-python@4.2.0a0.dev1528: fix(cli): restore V3 network capture through a CDP sidecar ( 2849) as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
Browserbase Stagehand releases published stagehand-python@4.2.0a0.dev1528: fix(cli): restore V3 network capture through a CDP sidecar ( 2849). This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Summary Restore Browse V3 network-capture behavior on Stagehand V4 through a CLI-private CDP sidecar, without committing core Stagehand, its protocol, or generated SDKs to a public network-event schema. Stack ( 2872) 2833 — exact Browse V3 baseline import 2834 — Stagehand V4 runtime and standard command parity 2869 — CLI-owned cursor overlay 2849 — CLI-private CDP sidecar; V3 network parity 2835 — remove --return-xpath ; supported V3 parity/release checkpoint 2838 — eval and packaging integration 2839 — managed Context names (fast-follow) 2701 — shared Functions core consumer (fast-follow) Architecture Lazily open one CLI-private browser-level CDP WebSocket using the endpoint already held by the initialized Stagehand client. Attach a flattened CDP session to the active V4 page target. Present the unchanged V3 network writer with the same on / off / send session shape. On network off ,…

## Recommended actions
- Review the official Browserbase Stagehand releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.